WO2010140780A2 - Three-way catalyst having a triple layer coating structure - Google Patents

Three-way catalyst having a triple layer coating structure Download PDF

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WO2010140780A2
WO2010140780A2 PCT/KR2010/003082 KR2010003082W WO2010140780A2 WO 2010140780 A2 WO2010140780 A2 WO 2010140780A2 KR 2010003082 W KR2010003082 W KR 2010003082W WO 2010140780 A2 WO2010140780 A2 WO 2010140780A2
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layer
way catalyst
rhodium
catalyst
palladium
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French (fr)
Korean (ko)
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WO2010140780A3 (en
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한현식
송진우
하재어
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희성촉매 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0244—Coatings comprising several layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/46—Ruthenium, rhodium, osmium or iridium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/42—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/46—Ruthenium, rhodium, osmium or iridium
    • B01J23/464—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/58—Platinum group metals with alkali- or alkaline earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J33/00—Protection of catalysts, e.g. by coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • B01D2255/9025—Three layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/908—O2-storage component incorporated in the catalyst
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a three-way catalyst for purifying exhaust gas of an internal combustion engine, and more specifically, a lower layer made of oxygen storage capacity (OSC), an intermediate layer made of rhodium (Rh) on the lower layer, and palladium or platinum on the intermediate layer. It relates to a three-way catalyst of a three-layer coating structure comprising a top layer consisting of any one or more selected from the group consisting of.
  • OSC oxygen storage capacity
  • Rh rhodium
  • the three-way catalyst refers to a catalyst that promotes the conversion of three hazardous substances contained in the gases emitted from internal combustion engines such as automobiles and other gasoline fuel engines into harmless gases.
  • the three harmful substances include nitrogen oxides (NOx), carbon monoxide (CO) and hydrocarbons (HC), and nitrogen oxides to nitrogen (N 2 ), carbon monoxide to carbon dioxide (CO 2 ), and hydrocarbons to three-way catalysts.
  • Water (H 2 O) is converted into harmless substances.
  • a three way catalyst converter equipped with a catalyst supported by a noble metal is installed in the exhaust system to promote emission of carbon monoxide, oxidation of carbon monoxide, and reduction of nitrogen oxide in order to satisfy emission standards.
  • the catalyst technology has been improved, the usage of precious metals has increased, and the research of the three-way catalyst which is advantageous in terms of economic feasibility while having excellent purification performance is being actively conducted.
  • three-way catalysts used for exhaust gas purification include one or more platinum group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) and ruthenium (Ru).
  • the catalyst material such as the platinum group metal is used as a catalyst supported on a high surface area refractory oxide substrate or support such as a spherical or honeycomb high surface area alumina coating or the like.
  • the three-way catalyst is generally alkaline earth metal oxides such as oxides of Ca, Sr and Ba, alkali metal oxides such as oxides of K, Na, Li and Cs, and rare earth metal oxides such as oxides of Ce, La, Pr and Nd. It is also used with oxygen storage materials (OSC).
  • OSC oxygen storage materials
  • palladium-based (Pd / Rh) catalysts especially palladium-based (Pd / Rh) catalysts having a three-layer coating structure is coated with an oxygen storage material layer on the substrate, the palladium layer coating on the oxygen storage material layer It is a general structure that a rhodium layer is coated thereon.
  • the present invention was derived to solve the above problems, to improve the structural problems of the conventional three-way catalyst, to protect the rhodium layer from poisoning caused by engine oil, and to store the oxygen storage material in rhodium
  • the present invention aims to provide a three-way catalyst for purifying exhaust gases in which synergy between rhodium-oxygen storage materials is improved and at the same time, activity of the palladium layer is not lowered in the low temperature operating section.
  • the present invention relates to a three-way catalyst having a three-layer coating structure, the lowest layer made of an oxygen storage material; An intermediate layer made of rhodium on the lowermost layer; It characterized in that it comprises a top layer made of any one or more selected from the group consisting of palladium and platinum on the intermediate layer.
  • a rhodium component which plays an important role in the reduction of nitrogen oxides, is coated on the intermediate layer between the uppermost layer and the lowermost layer, so that it is not exposed to engine oil, thereby suppressing deterioration of activity due to poisoning of the catalyst.
  • the layer containing palladium with excellent activity is coated on the top layer, so that the activity of palladium at low temperature for hydrocarbon, carbon monoxide and nitrogen oxides is not lowered, and the oxygen storage material is added to the intermediate layer made of rhodium. Due to the synergy between the storage materials has the effect of improving the activity of the nitrogen oxides.
  • the lowermost layer is made of an oxygen storage material or an oxygen storage material containing palladium, there is an effect of improving the activity of nitrogen oxide at high temperature.
  • Figure 1 shows the catalyst layer arrangement of the three-way catalyst of the triple layer coating structure according to the present invention.
  • Figure 2 shows the catalyst layer arrangement of Comparative Example 1 which is a three-way catalyst of a conventional triple layer coating structure.
  • Figure 3 shows the overall reduction of the hydrocarbons, nitrogen oxides and carbon monoxide of Example 1 and Comparative Example 1.
  • Figure 4 shows the trend of hydrocarbon reduction according to the operating temperature section of Example 1 and Comparative Example 1.
  • Figure 5 shows the trend of reduction of nitrogen oxides according to the operating temperature section of Example 1 and Comparative Example 1.
  • Figure 6 shows the trend of carbon monoxide reduction according to the operating temperature section of Example 1 and Comparative Example 1.
  • the present invention relates to a three-way catalyst for exhaust gas purification of an internal combustion engine, and more specifically, from a lower layer made of oxygen storage material (OSC), an intermediate layer made of rhodium (Rh) on the lower layer, and palladium and platinum on the middle layer. It relates to a three-way catalyst of a three-layer coating structure comprising a top layer consisting of any one or more selected.
  • OSC oxygen storage material
  • Rh rhodium
  • the lowermost layer is made of an oxygen storage material, and in some cases, may contain palladium (Pd) in the oxygen storage material, thereby enhancing the activity of nitrogen oxide at high temperature.
  • the oxygen storage material may be used as long as it has a material capable of storing oxygen, for example, alkaline earth metal oxides such as oxides of Ca, Sr and Ba, and alkali metals such as oxides of K, Na, Li, and Cs. Oxides and rare earth metal oxides such as oxides of Ce, La, Pr and Nd and the like can be used.
  • the intermediate layer is made of rhodium (Rh), and in some cases, a platinum group element other than rhodium may be added to the rhodium, and preferably, platinum (Pt) may be added to the rhodium.
  • Rh rhodium
  • Pt platinum
  • the three-way catalyst of the three-layer coating structure according to the present invention is used by coating the catalytic material such as palladium, rhodium, oxygen storage material on a high surface area refractory oxide support such as a high surface area alumina coating.
  • the support may be on a monolithic carrier such as a refractory ceramic or metal honeycomb structure, or on a suitable carrier or substrate such as refractory particles such as spheres or short extruded pieces of suitable refractory material.
  • the present invention is dried and baked by applying an oxygen storage material (OSC) layer on a high surface area refractory oxide support, the rhodium (Rh) layer is coated on the intermediate layer, dried and baked, and finally the top layer It can be prepared through the process of applying, drying and baking the palladium (Pd) layer.
  • OSC oxygen storage material
  • Rh rhodium
  • OSC oxygen storage material
  • colloidal silica colloidal silica as a binder
  • the OSC-containing slurry was first coated by immersing a ceramic honeycomb monolith substrate (105.7 * 115) having a number of cells per square inch (CPSI) of 600 and a wall thickness of 3.0 millimeters, and then coating 120 ° C. Dried for 4 hours and calcined at 550 ° C. for 2 hours.
  • OSC oxygen storage material
  • CPSI cells per square inch
  • rhodium solution 3 parts by weight of the rhodium solution was supported on 30 parts by weight of ceria and 67 parts by weight of the alumina carrier, and then wet milled to prepare a slurry. Subsequently, the monolith substrate first coated on the rhodium-containing slurry was immersed in a second coating, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours.
  • the palladium solution was supported on 30 parts by weight of ceria and 60 parts by weight of alumina carrier, and then wet milled to prepare a slurry.
  • the monolith substrate coated with the secondary coating was immersed in the slurry containing palladium, and then coated in a third manner, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours to complete a three-way catalyst.
  • the three-way catalyst arrangement of the triple layer coating structure of Example 1 according to the present invention is as shown in FIG. 1.
  • OSC oxygen storage material
  • colloidal silica colloidal silica as a binder
  • the OSC-containing slurry was first coated by immersing a ceramic honeycomb monolith substrate (105.7 * 115) having a number of cells per square inch (CPSI) of 600 and a wall thickness of 3.0 millimeters, and then coating 120 ° C. Dried for 4 hours and calcined at 550 ° C. for 2 hours.
  • OSC oxygen storage material
  • CPSI cells per square inch
  • the palladium solution was supported on 30 parts by weight of ceria and 60 parts by weight of an alumina carrier, and then wet milled to prepare a slurry.
  • the monolith substrate first coated in the slurry containing the palladium was immersed in a second coating, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours.
  • rhodium solution 3 parts by weight was supported on 30 parts by weight of ceria and 67 parts by weight of the alumina carrier, and then wet milled to prepare a slurry.
  • the monolith substrate coated with the secondary coating was immersed in the slurry containing rhodium, and then coated in a third manner, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours to complete a three-way catalyst.
  • the catalyst layer arrangement of the catalyst completed by Comparative Example 1 is as shown in FIG.
  • Example 1 The three-way catalysts prepared in Example 1 and Comparative Example 1 were deteriorated in an engine bench deterioration mode corresponding to a driving distance of 80,000 km, and then mounted on a vehicle to evaluate exhaust gas purification performance.
  • Example 1 the three-way catalysts prepared in Example 1 and Comparative Example 1 were mounted in a vehicle bottom position type catalytic converter (UCC), and then operated in the evaluation mode (FTP-75) while exhausting hydrocarbon emissions and nitrogen oxides of exhaust gas. Emissions and carbon monoxide emissions were measured.
  • UCC vehicle bottom position type catalytic converter
  • FTP-75 the evaluation mode
  • Example 1 improved the low-temperature activity of the catalyst by 17% improved hydrocarbon (HC) reduction compared to Comparative Example 1 (Current Design), the embodiment according to the present invention in the high temperature operating section It was confirmed that 1 (New Concept) improved 33% of the hydrocarbon (HC) reduction effect compared to Comparative Example 1 (Current Design), thereby improving the high temperature activity of the catalyst.
  • Example 1 According to the operating temperature section of Example 1 (New Concept) and Comparative Example 1 (Current Design) according to the present invention through the data shown in Figure 5, in the low-temperature operating section Example 1 (New Concept) according to the present invention compared to Comparative Example 1 (Current Design) improved the nitrogen oxides (NOx) reduction effect by 29% improved the low temperature activity of the catalyst, Example 1 according to the present invention in the high temperature operating section (New Concept) was confirmed to improve the high temperature activity of the catalyst by improving the reduction effect of nitrogen oxides (NOx) by 12% compared to Comparative Example 1 (Current Design).
  • Example 1 in the low temperature operating section
  • Comparative Example 1 Comparative Example 1 (Current Design) according to the present invention
  • Example 1 (New Concept) 25% improvement in the reduction effect of carbon monoxide (CO) compared to Comparative Design 1 (Current Design) improved the low-temperature activity of the catalyst
  • Example 1 (New) in the high temperature operating section Concept) showed a 37% improvement in carbon monoxide (CO) reduction compared to Comparative Design 1 (Current Design), thereby improving the high temperature activity of the catalyst.

Abstract

The present invention relates to a three-way catalyst for purifying exhaust gas emitted by an internal combustion engine. More particularly, the present invention relates to a three-way catalyst having a triple layer coating structure, comprising a bottom layer made of an oxygen storage capacity (OSC) material, an intermediate layer made of rhodium (Rh) and formed on the bottom layer, and a top layer made of one or more materials selected from a group consisting of palladium and platinum and formed on the intermediate layer.

Description

3중층 코팅구조의 삼원촉매Three way catalyst with triple layer coating structure
본 발명은 내연기관 배기가스 정화용 삼원 촉매에 관한 것으로, 보다 구체적으로는 산소저장물질(Oxygen Storage Capacity, OSC)로 이루어진 최하층, 상기 최하층의 위에 로듐(Rh)으로 이루어진 중간층, 상기 중간층 위에 팔라듐 또는 백금으로 이루어진 군으로부터 선택된 어느 하나 이상으로 이루어진 최상층을 포함하는 3중층 코팅구조의 삼원 촉매에 관한 것이다.The present invention relates to a three-way catalyst for purifying exhaust gas of an internal combustion engine, and more specifically, a lower layer made of oxygen storage capacity (OSC), an intermediate layer made of rhodium (Rh) on the lower layer, and palladium or platinum on the intermediate layer. It relates to a three-way catalyst of a three-layer coating structure comprising a top layer consisting of any one or more selected from the group consisting of.
통상적으로 삼원 촉매란 자동차 및 다른 가솔린 연료 엔진과 같은 내연 기관에서 배출되는 가스에 포함되어 있는 3가지 유해 물질을 무해한 가스로 변환시키는 것을 촉진하는 촉매를 의미한다. 상기 3가지 유해 물질로는 질소산화물(NOx), 일산화탄소(CO) 및 탄화수소(HC)이 있으며, 삼원 촉매를 통하여 질소산화물은 질소(N2)로, 일산화탄소는 이산화탄소(CO2)로, 탄화수소는 물(H2O)로 각각 무해 물질로 변환된다.Typically, the three-way catalyst refers to a catalyst that promotes the conversion of three hazardous substances contained in the gases emitted from internal combustion engines such as automobiles and other gasoline fuel engines into harmless gases. The three harmful substances include nitrogen oxides (NOx), carbon monoxide (CO) and hydrocarbons (HC), and nitrogen oxides to nitrogen (N 2 ), carbon monoxide to carbon dioxide (CO 2 ), and hydrocarbons to three-way catalysts. Water (H 2 O) is converted into harmless substances.
최근 들어, 자동차의 이용도가 증가하고 교통량이 증가함에 따라 배기가스로 인한 대기오염의 문제가 심각한 사회문제로 대두 되고 있다. 따라서, 각국의 정부는 배기가스 규제를 위하여 배기가스 내 질소산화물(NOx), 일산화탄소(CO) 및 탄화수소(HC)와 같은 오염물질에 대한 배출기준을 정해놓고 있으며, 이러한 배기가스 규제는 점차 강화되고 있는 추세이다. 또한, 각 자동차 제조사들은 한층 강화되고 있는 배기가스 규제에 효과적으로 대응하기 위하여 많은 노력을 기울이고 있는 실정이며, 신규 차량은 배기가스 배출기준에 맞추어 생산하고 있다.Recently, the problem of air pollution due to exhaust gas has become a serious social problem as the use of automobiles and the traffic volume increase. Therefore, governments have set emission standards for pollutants such as nitrogen oxides (NOx), carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas to regulate the exhaust gas. There is a trend. In addition, each automobile manufacturer is making a lot of efforts to effectively respond to the tightening emission regulations, new vehicles are produced in accordance with the emission standards.
특히, 자동차에서는 배기가스 배출기준을 충족시키기 위하여 귀금속 담지의 촉매가 설치된 삼원촉매 컨버터(three way catalyst converter)가 배기계에 장착되어 탄화수소의 분해, 일산화탄소의 산화 및 질소산화물의 환원을 촉진시킨다. 현재, 각국의 배기가스 규제가 강화되면서 촉매기술이 향상되었고, 귀금속의 사용량도 증가하였으며, 우수한 정화성능을 가지면서도 실용화가 가능하고 경제성 측면에서 유리한 삼원 촉매의 연구가 활발히 진행 중에 있다.In particular, in automobiles, a three way catalyst converter equipped with a catalyst supported by a noble metal is installed in the exhaust system to promote emission of carbon monoxide, oxidation of carbon monoxide, and reduction of nitrogen oxide in order to satisfy emission standards. At present, as the exhaust gas regulation of each country is strengthened, the catalyst technology has been improved, the usage of precious metals has increased, and the research of the three-way catalyst which is advantageous in terms of economic feasibility while having excellent purification performance is being actively conducted.
일반적으로 배기가스 정화에 사용되는 삼원촉매는 백금(Pt), 팔라듐(Pd), 로듐(Rh) 및 루테늄(Ru) 같은 1종 이상의 백금족 금속를 포함한다. 상기 백금족 금속과 같은 촉매 물질은 구형 또는 벌집형의 고표면적 알루미나 코팅물 등과 같은 고표면적의 내화성 산화물 기재(substrate) 또는 지지체(support) 상에 담지되어 촉매로서 사용된다. 또한, 상기 삼원촉매는 일반적으로 Ca, Sr 및 Ba의 산화물 등과 같은 알칼리 토금속 산화물, K, Na, Li 및 Cs의 산화물 등과 같은 알칼리 금속 산화물 및 Ce, La, Pr 및 Nd의 산화물 등과 같은 희토류 금속 산화물을 비롯한 산소 저장 물질(OSC)과 함께 사용되기도 한다.In general, three-way catalysts used for exhaust gas purification include one or more platinum group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) and ruthenium (Ru). The catalyst material such as the platinum group metal is used as a catalyst supported on a high surface area refractory oxide substrate or support such as a spherical or honeycomb high surface area alumina coating or the like. In addition, the three-way catalyst is generally alkaline earth metal oxides such as oxides of Ca, Sr and Ba, alkali metal oxides such as oxides of K, Na, Li and Cs, and rare earth metal oxides such as oxides of Ce, La, Pr and Nd. It is also used with oxygen storage materials (OSC).
최근 자동차 배기규제가 강화됨에 따라 삼원촉매에 함유되는 백금(Pt) 함량이 증가하여 원가상승의 원인이 되고 있으며, 이를 해결하기 위하여 백금 전부 또는 일부를 보다 저렴한 팔라듐(Pd)으로 대체하려는 시도가 계속되고 있다. 그러나, 백금계(Pt/Rh) 촉매의 탄화수소 산화율이 팔라듐계(Pd/Rh) 촉매보다 우수하므로 팔라듐계(Pd/Rh) 촉매를 물리적 및/또는 화학적으로 개선하고자 하는 다양한 연구가 시도되고 있다.Recently, as the exhaust regulations of automobiles are strengthened, the content of platinum (Pt) in ternary catalysts is increasing, which causes cost increase. To solve this problem, attempts to replace all or part of platinum with cheaper palladium (Pd) continue to be made. It is becoming. However, various studies have been attempted to physically and / or chemically improve the palladium-based (Pd / Rh) catalyst because the hydrocarbon oxidation rate of the platinum-based (Pt / Rh) catalyst is superior to that of the palladium-based (Pd / Rh) catalyst.
현재 상용되고 있는 팔라듐계(Pd/Rh) 촉매, 특히 3중층 코팅구조를 가지는 팔라듐계(Pd/Rh) 촉매는 기재 상에 산소저장물질 층이 코팅되며, 상기 산소저장물질 층 위에 팔라듐 층이 코팅되고, 그 위에 로듐 층이 코팅되어 있는 것이 일반적인 구조이다. Currently commercially available palladium-based (Pd / Rh) catalysts, especially palladium-based (Pd / Rh) catalysts having a three-layer coating structure is coated with an oxygen storage material layer on the substrate, the palladium layer coating on the oxygen storage material layer It is a general structure that a rhodium layer is coated thereon.
하지만, 상기와 같은 기존의 삼원촉매는 구조상 질소산화물의 저감에 가장 크게 기여하면서 가장 고가인 로듐 층이 최상층에 위치하여 노출됨으로서 엔진오일에 의한 로듐층 피독현상으로 인하여 촉매의 활성이 극도로 저해되는 문제가 있으며, 로듐 및 산소저장물질 간의 시너지(Synergy) 향상을 유도하기 위하여 최상층에 산소저장물질을 첨가하게 되고, 이로써 최상층의 두께가 두꺼워지게 되어 중간층인 팔라듐 층의 저온가동구간에서의 활성이 저해되는 문제점이 있다.However, such a conventional three-way catalyst has the greatest contribution to the reduction of nitrogen oxides in structure, and the most expensive rhodium layer is located at the top layer, so that the activity of the catalyst is extremely inhibited due to the rhodium layer poisoning caused by engine oil. There is a problem, and in order to induce synergy between rhodium and oxygen storage material, oxygen storage material is added to the uppermost layer, and the thickness of the uppermost layer is thickened, which inhibits the activity in the low temperature operating section of the intermediate layer palladium layer. There is a problem.
본 발명은 상기와 같은 문제점을 해결하기 위해 도출된 것으로서, 기존의 삼원촉매가 가지고 있는 구조상의 문제점을 개선하여, 엔진오일에 의한 피독현상으로부터 로듐층을 보호할 수 있고, 로듐에 산소저장물질을 첨가하여 로듐-산소저장물질간의 시너지(Synergy) 향상을 유도하는 동시에 팔라듐 층의 저온가동구간에서의 활성이 저하되지 아니하는 배기가스 정화용 삼원 촉매를 제공하는데 그 목적이 있다.The present invention was derived to solve the above problems, to improve the structural problems of the conventional three-way catalyst, to protect the rhodium layer from poisoning caused by engine oil, and to store the oxygen storage material in rhodium The present invention aims to provide a three-way catalyst for purifying exhaust gases in which synergy between rhodium-oxygen storage materials is improved and at the same time, activity of the palladium layer is not lowered in the low temperature operating section.
본 발명은 3중층 코팅구조의 삼원촉매에 관한 것으로서, 산소저장물질로 이루어진 최하층; 상기 최하층의 위에 로듐으로 이루어진 중간층; 상기 중간층 위에 팔라듐 및 백금으로 이루어진 군으로부터 선택된 어느 하나 이상으로 이루어진 최상층을 포함하는 것을 특징으로 한다.The present invention relates to a three-way catalyst having a three-layer coating structure, the lowest layer made of an oxygen storage material; An intermediate layer made of rhodium on the lowermost layer; It characterized in that it comprises a top layer made of any one or more selected from the group consisting of palladium and platinum on the intermediate layer.
본 발명에 의하면, 질소산화물의 환원에 중요한 역할을 하는 로듐 성분이 최상층 및 최하층의 사이인 중간층에 코팅되어 있어, 엔진오일에 노출되지 않아 촉매의 피독에 의한 활성 저하를 억제할 수 있으며, 저온구간에서 활성이 우수한 팔라듐을 포함하는 층이 최상층에 코팅되어 있어, 팔라듐의 탄화수소, 일산화탄소 및 질소산화물에 대한 저온구간에서의 활성이 저하되지 않는 동시에 로듐으로 이루어진 중간층에 산소저장물질을 첨가하여 로듐-산소저장물질 간의 시너지 향상으로 인하여 질소산화물의 활성을 향상시키는 효과가 있다.According to the present invention, a rhodium component, which plays an important role in the reduction of nitrogen oxides, is coated on the intermediate layer between the uppermost layer and the lowermost layer, so that it is not exposed to engine oil, thereby suppressing deterioration of activity due to poisoning of the catalyst. At this time, the layer containing palladium with excellent activity is coated on the top layer, so that the activity of palladium at low temperature for hydrocarbon, carbon monoxide and nitrogen oxides is not lowered, and the oxygen storage material is added to the intermediate layer made of rhodium. Due to the synergy between the storage materials has the effect of improving the activity of the nitrogen oxides.
나아가, 본 발명에 의하면, 최하층이 산소저장물질 또는 팔라듐이 함유된 산소저장물질로 이루어져 있어, 고온에서 질소산화물의 활성이 향상되는 효과가 있다.Furthermore, according to the present invention, since the lowermost layer is made of an oxygen storage material or an oxygen storage material containing palladium, there is an effect of improving the activity of nitrogen oxide at high temperature.
도 1은 본 발명에 따른 3중층 코팅구조의 삼원 촉매의 촉매 층 배치를 도시한 것이다.Figure 1 shows the catalyst layer arrangement of the three-way catalyst of the triple layer coating structure according to the present invention.
도 2는 종래의 3중층 코팅구조의 삼원 촉매인 비교예 1의 촉매 층 배치를 도시한 것이다.Figure 2 shows the catalyst layer arrangement of Comparative Example 1 which is a three-way catalyst of a conventional triple layer coating structure.
도 3은 실시예 1 및 비교예 1의 탄화수소, 질소산화물 및 일산화탄소에 대한 저감효과를 전체적으로 나타낸 것이다.Figure 3 shows the overall reduction of the hydrocarbons, nitrogen oxides and carbon monoxide of Example 1 and Comparative Example 1.
도 4는 실시예 1 및 비교예 1의 가동온도구간에 따른 탄화수소의 저감 추이를 도시한 것이다.Figure 4 shows the trend of hydrocarbon reduction according to the operating temperature section of Example 1 and Comparative Example 1.
도 5는 실시예 1 및 비교예 1의 가동온도구간에 따른 질소산화물의 저감 추이를 도시한 것이다.Figure 5 shows the trend of reduction of nitrogen oxides according to the operating temperature section of Example 1 and Comparative Example 1.
도 6은 실시예 1 및 비교예 1의 가동온도구간에 따른 일산화탄소의 저감 추이를 도시한 것이다.Figure 6 shows the trend of carbon monoxide reduction according to the operating temperature section of Example 1 and Comparative Example 1.
본 발명은 내연기관 배기가스 정화용 삼원 촉매에 관한 것으로, 보다 구체적으로는 산소저장물질(OSC)로 이루어진 최하층, 상기 최하층의 위에 로듐(Rh)으로 이루어진 중간층, 상기 중간층 위에 팔라듐 및 백금으로 이루어진 군으로부터 선택된 어느 하나 이상으로 이루어진 최상층을 포함하는 3중층 코팅구조의 삼원촉매에 관한 것이다.The present invention relates to a three-way catalyst for exhaust gas purification of an internal combustion engine, and more specifically, from a lower layer made of oxygen storage material (OSC), an intermediate layer made of rhodium (Rh) on the lower layer, and palladium and platinum on the middle layer. It relates to a three-way catalyst of a three-layer coating structure comprising a top layer consisting of any one or more selected.
상기 최하층은 산소저장물질로 이루어지고, 경우에 따라서는 상기 산소저장물질에 팔라듐(Pd)을 함유할 수 있으며, 고온에서 질소산화물의 활성을 증진시킨다. 상기 산소저장물질은 산소 저장능력이 있는 물질이라면 어느 것을 사용하여도 무방하며, 예를 들면, Ca, Sr 및 Ba의 산화물 등과 같은 알칼리 토금속 산화물, K, Na, Li 및 Cs의 산화물 등과 같은 알칼리 금속 산화물 및 Ce, La, Pr 및 Nd의 산화물 등과 같은 희토류 금속 산화물이 사용될 수 있다. The lowermost layer is made of an oxygen storage material, and in some cases, may contain palladium (Pd) in the oxygen storage material, thereby enhancing the activity of nitrogen oxide at high temperature. The oxygen storage material may be used as long as it has a material capable of storing oxygen, for example, alkaline earth metal oxides such as oxides of Ca, Sr and Ba, and alkali metals such as oxides of K, Na, Li, and Cs. Oxides and rare earth metal oxides such as oxides of Ce, La, Pr and Nd and the like can be used.
상기 중간층은 로듐(Rh)으로 이루어지고, 경우에 따라서는 상기 로듐에 로듐 이외의 백금족 원소가 첨가될 수 있으며, 바람직하게는 상기 로듐에 백금(Pt)이 첨가될 수 있다. The intermediate layer is made of rhodium (Rh), and in some cases, a platinum group element other than rhodium may be added to the rhodium, and preferably, platinum (Pt) may be added to the rhodium.
본 발명에 따른 3중층 코팅구조의 삼원촉매는 상기 팔라듐, 로듐, 산소저장물질과 같은 촉매 물질이 고표면적 알루미나 코팅물 등과 같은 고표면적의 내화성 산화물 지지체에 코팅되어 사용된다. 상기 지지체는 내화성 세라믹 또는 금속 벌집형 구조물 등의 모노리스 (monolithic) 캐리어, 또는 적합한 내화성 물질로 된 구체 또는 짧은 압출 단편 등의 내화성 입자 등과 같은 적합한 캐리어 또는 기판상이 될 수 있다. 즉, 본 발명은 고표면적의 내화성 산화물 지지체 상에 산소저장물질(OSC) 층을 도포하여 건조 및 소성하고, 그 위에 중간층으로 로듐(Rh) 층이 코팅되고 건조 및 소성 된 후, 마지막으로 최상층에 팔라듐(Pd) 층을 도포하고 건조 및 소성하는 공정을 통해 제조될 수 있다. The three-way catalyst of the three-layer coating structure according to the present invention is used by coating the catalytic material such as palladium, rhodium, oxygen storage material on a high surface area refractory oxide support such as a high surface area alumina coating. The support may be on a monolithic carrier such as a refractory ceramic or metal honeycomb structure, or on a suitable carrier or substrate such as refractory particles such as spheres or short extruded pieces of suitable refractory material. That is, the present invention is dried and baked by applying an oxygen storage material (OSC) layer on a high surface area refractory oxide support, the rhodium (Rh) layer is coated on the intermediate layer, dried and baked, and finally the top layer It can be prepared through the process of applying, drying and baking the palladium (Pd) layer.
이하 본 발명에 따른 3중층 코팅구조의 삼원촉매를 실시예를 통하여 보다 상세하게 설명하도록 한다. 하기의 실시예는 오로지 본 발명을 구체적으로 설명하기 위한 것으로 하기의 설명에 의하여 본 발명의 범위가 한정되는 것은 아니다.Hereinafter, the three-way catalyst of the triple-layer coating structure according to the present invention will be described in more detail with reference to Examples. The following examples are only for illustrating the present invention in detail, and the scope of the present invention is not limited by the following description.
<실시예 1> <Example 1>
먼저, 통상적인 산소저장물질 (OSC) 70 중량부와 바인더인 콜로이달 실리카 30 중량부를 섞고, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 OSC가 함유된 슬러리에 제곱 인치 당 셀의 수 (CPSI)가 600개이고, 벽 두께가 3.0 밀리인치인 세라믹 벌집구조의 모노리스 기판(105.7*115)을 침지시켜 1차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켰다.First, 70 parts by weight of a conventional oxygen storage material (OSC) and 30 parts by weight of colloidal silica as a binder were mixed and wet milled to prepare a slurry. Thereafter, the OSC-containing slurry was first coated by immersing a ceramic honeycomb monolith substrate (105.7 * 115) having a number of cells per square inch (CPSI) of 600 and a wall thickness of 3.0 millimeters, and then coating 120 ° C. Dried for 4 hours and calcined at 550 ° C. for 2 hours.
다음으로, 로듐 용액 3 중량부를 세리아 30 중량부와 알루미나 담지체 67 중량부에 담지시킨 후, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 로듐이 함유된 슬러리에 1차 코팅된 상기 모노리스 기판을 침지시켜 2차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켰다.Next, 3 parts by weight of the rhodium solution was supported on 30 parts by weight of ceria and 67 parts by weight of the alumina carrier, and then wet milled to prepare a slurry. Subsequently, the monolith substrate first coated on the rhodium-containing slurry was immersed in a second coating, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours.
마지막으로, 팔라듐 용액 10 중량부를 세리아 30 중량부와 알루미나 담지체 60 중량부에 담지시킨 후, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 팔라듐이 함유된 슬러리에 2차 코팅된 상기 모노리스 기판을 담가서 3차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켜 삼원촉매를 완성하였다.Finally, 10 parts by weight of the palladium solution was supported on 30 parts by weight of ceria and 60 parts by weight of alumina carrier, and then wet milled to prepare a slurry. Subsequently, the monolith substrate coated with the secondary coating was immersed in the slurry containing palladium, and then coated in a third manner, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours to complete a three-way catalyst.
본 발명에 따른 상기 실시예 1의 3중층 코팅구조의 삼원촉매 배치는 도 1에서 도시한 바와 같다.The three-way catalyst arrangement of the triple layer coating structure of Example 1 according to the present invention is as shown in FIG. 1.
<비교예 1>Comparative Example 1
통상적인 산소저장물질(OSC) 70 중량부와 바인더인 콜로이달 실리카 30 중량부를 섞고, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 OSC가 함유된 슬러리에 제곱 인치 당 셀의 수 (CPSI)가 600개이고, 벽 두께가 3.0 밀리인치인 세라믹 벌집구조의 모노리스 기판(105.7*115)을 침지시켜 1차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켰다.70 parts by weight of a conventional oxygen storage material (OSC) and 30 parts by weight of colloidal silica as a binder were mixed and wet milled to prepare a slurry. Thereafter, the OSC-containing slurry was first coated by immersing a ceramic honeycomb monolith substrate (105.7 * 115) having a number of cells per square inch (CPSI) of 600 and a wall thickness of 3.0 millimeters, and then coating 120 ° C. Dried for 4 hours and calcined at 550 ° C. for 2 hours.
다음으로, 팔라듐 용액 10 중량부를 세리아 30 중량부와 알루미나 담지체 60 중량부에 담지시킨 후, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 팔라듐이 함유된 슬러리에 1차 코팅된 상기 모노리스 기판을 침지시켜 2차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켰다.Next, 10 parts by weight of the palladium solution was supported on 30 parts by weight of ceria and 60 parts by weight of an alumina carrier, and then wet milled to prepare a slurry. Subsequently, the monolith substrate first coated in the slurry containing the palladium was immersed in a second coating, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours.
마지막으로, 로듐 용액 3 중량부를 세리아 30 중량부와 알루미나 담지체 67 중량부에 담지시킨 후, 이를 습식 밀링하여 슬러리로 제조하였다. 이후, 상기 로듐이 함유된 슬러리에 2차 코팅된 상기 모노리스 기판을 담가서 3차로 코팅한 후 120℃에서 4시간 동안 건조시키고, 550℃에서 2시간 동안 소성시켜 삼원촉매를 완성하였다. Finally, 3 parts by weight of the rhodium solution was supported on 30 parts by weight of ceria and 67 parts by weight of the alumina carrier, and then wet milled to prepare a slurry. Subsequently, the monolith substrate coated with the secondary coating was immersed in the slurry containing rhodium, and then coated in a third manner, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours to complete a three-way catalyst.
상기 비교예 1에 의해 완성된 촉매의 촉매 층 배치구조는 도 2에 나타난 바와 같다.The catalyst layer arrangement of the catalyst completed by Comparative Example 1 is as shown in FIG.
<시험 방법><Test method>
상기 실시예 1 및 비교예 1에서 제조된 삼원촉매를 실차 8만㎞ 주행에 해당하는 엔진벤치 열화모드에서 열화시킨 후 차량에 장착하여 배기가스 정화성능을 평가하였다.The three-way catalysts prepared in Example 1 and Comparative Example 1 were deteriorated in an engine bench deterioration mode corresponding to a driving distance of 80,000 km, and then mounted on a vehicle to evaluate exhaust gas purification performance.
상기 평가시에는 실시예 1 및 비교예 1에서 제조된 각 삼원촉매를 차 바닥위치 설치형 촉매컨버터(UCC)에 장착한 후, 평가모드(FTP-75)로 운전하면서 배기가스의 탄화수소 배출량, 질소산화물 배출량 및 일산화탄소 배출량을 측정하였다.In the evaluation, the three-way catalysts prepared in Example 1 and Comparative Example 1 were mounted in a vehicle bottom position type catalytic converter (UCC), and then operated in the evaluation mode (FTP-75) while exhausting hydrocarbon emissions and nitrogen oxides of exhaust gas. Emissions and carbon monoxide emissions were measured.
시험 결과, 도 3에서 나타난 바와 같이 비교예 1(Current Design)의 삼원 촉매에 비하여 본 발명에 따른 실시예 1(New Concept)의 삼원 촉매가 전체적인 성능면에서, 탄화수소(HC) 저감 효과는 20% 향상되고, 질소산화물(NOx) 저감 효과는 21% 향상되며, 일산화탄소(CO) 저감 효과는 32% 향상됨을 확인하였다.As a result, as shown in Figure 3, compared to the three-way catalyst of Comparative Design (Current Design), the three-way catalyst of Example 1 (New Concept) according to the present invention in terms of overall performance, the hydrocarbon (HC) reduction effect is 20% It was confirmed that the NOx reduction effect was improved by 21%, and the carbon monoxide reduction effect was improved by 32%.
도 4에 나타난 데이터를 통해 본 발명에 따른 실시예 1(New Concept) 및 비교예 1(Current Design)의 가동온도구간에 따른 탄화수소(HC)의 저감 효과를 보다 상세하게 살펴보면, 저온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 탄화수소(HC)의 저감 효과가 17% 향상되어 촉매의 저온 활성이 향상되었으며, 고온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 탄화수소(HC)의 저감 효과가 33% 향상되어 촉매의 고온 활성이 향상되었음을 확인하였다. Looking at the effect of reducing the hydrocarbon (HC) according to the operating temperature section of Example 1 (New Concept) and Comparative Example 1 (Current Design) according to the present invention through the data shown in Figure 4, in the low-temperature operating section Example 1 (New Concept) according to the invention improved the low-temperature activity of the catalyst by 17% improved hydrocarbon (HC) reduction compared to Comparative Example 1 (Current Design), the embodiment according to the present invention in the high temperature operating section It was confirmed that 1 (New Concept) improved 33% of the hydrocarbon (HC) reduction effect compared to Comparative Example 1 (Current Design), thereby improving the high temperature activity of the catalyst.
도 5에 나타난 데이터를 통해 본 발명에 따른 실시예 1(New Concept) 및 비교예 1(Current Design)의 가동온도구간에 따른 질소산화물(NOx)의 저감 효과를 살펴보면, 저온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 질소산화물(NOx)의 저감 효과가 29% 향상되어 촉매의 저온 활성이 향상되었으며, 고온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 질소산화물(NOx)의 저감 효과가 12% 향상되어 촉매의 고온 활성이 향상되었음을 확인하였다. Looking at the reduction effect of nitrogen oxide (NOx) according to the operating temperature section of Example 1 (New Concept) and Comparative Example 1 (Current Design) according to the present invention through the data shown in Figure 5, in the low-temperature operating section Example 1 (New Concept) according to the present invention compared to Comparative Example 1 (Current Design) improved the nitrogen oxides (NOx) reduction effect by 29% improved the low temperature activity of the catalyst, Example 1 according to the present invention in the high temperature operating section (New Concept) was confirmed to improve the high temperature activity of the catalyst by improving the reduction effect of nitrogen oxides (NOx) by 12% compared to Comparative Example 1 (Current Design).
도 6에 나타난 데이터를 통해 본 발명에 따른 실시예 1(New Concept) 및 비교예 1(Current Design)의 가동온도구간에 따른 일산화탄소(CO)의 저감 효과를 살펴보면, 저온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 일산화탄소(CO)의 저감 효과가 25% 향상되어 촉매의 저온 활성이 향상되었으며, 고온가동구간에서는 본 발명에 따른 실시예 1(New Concept)이 비교예 1(Current Design)에 비하여 일산화탄소(CO)의 저감 효과가 37% 향상되어 촉매의 고온 활성이 향상되었음을 확인하였다. Looking at the reduction effect of carbon monoxide (CO) according to the operating temperature section of Example 1 (New Concept) and Comparative Example 1 (Current Design) according to the present invention through the data shown in Figure 6, in the low temperature operating section Example 1 (New Concept) 25% improvement in the reduction effect of carbon monoxide (CO) compared to Comparative Design 1 (Current Design) improved the low-temperature activity of the catalyst, Example 1 (New) in the high temperature operating section Concept) showed a 37% improvement in carbon monoxide (CO) reduction compared to Comparative Design 1 (Current Design), thereby improving the high temperature activity of the catalyst.

Claims (3)

  1. 산소저장물질로 이루어진 최하층; 상기 최하층의 위에 로듐으로 이루어진 중간층; 상기 중간층 위에 팔라듐 또는 백금으로 이루어진 군으로부터 선택된 어느 하나 이상으로 이루어진 최상층을 포함하는 3중층 코팅구조의 삼원 촉매.A lower layer made of an oxygen storage material; An intermediate layer made of rhodium on the lowermost layer; Three-way catalyst having a three-layer coating structure comprising a top layer consisting of any one or more selected from the group consisting of palladium or platinum on the intermediate layer.
  2. 제 1항에 있어서,The method of claim 1,
    상기 최하층은 산소저장물질에 팔라듐을 함유하는 것을 특징으로 하는 3중층 코팅구조의 삼원 촉매.The lowermost layer is a three-way catalyst having a three-layer coating structure, characterized in that it contains palladium in the oxygen storage material.
  3. 제 1항에 있어서,The method of claim 1,
    상기 중간층은 로듐에 백금을 함유하는 것을 특징으로 하는 3중층 코팅구조의 삼원 촉매.The intermediate layer is a three-way catalyst of a three-layer coating structure, characterized in that it contains platinum in rhodium.
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